Wall Street sign and the front of the New York Stock Exchange on September 16, 2008. Global stock markets went into a dizzying fall Monday as the collapse of US investment bank Lehman Brothers sparked fears that more bad news is on the horizon for the finance sector and the economy. The blue-chip Dow Jones Industrial Average tumbled below 11,000 with a slide of 4.42 percent to 10,917.51, its largest one-day point loss since the reopening after the September 2001 terrorist attacks. The Nasdaq composite plummeted 3.60 percent to 2,179.91 and the broad-market Standard & Poor’s 500 index skidded 4.71 percent to 1,192.70. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)